Syntax

Description

nag_det_withdraw_real_gen (f03aa) calculates the determinant of AA using the LULU factorization with partial pivoting, PA = LUPA=LU, where PP is a permutation matrix, LL is lower triangular and UU is unit upper triangular. The determinant of AA is the product of the diagonal elements of LL with the correct sign determined by the row interchanges.